Table E-1. Adjusted odds ratios
†for risk factors associated with in-hospital mortality after hip procedures
Type of hip procedure
Characteristics THR PHR RHR
Age
25-64 -- -- --
65-74 0.94 1.15 1.61
75-84 2.58* 1.63* 3.70*
85 or older 6.92** 2.37** 4.94**
Gender
Male -- -- --
Female 0.85 0.55** 1.02
Comorbidity
Congestive heart failure 2.72** 2.51** 2.30*
Chronic pulmonary disease 1.76** 1.43** 0.45
Diabetes 1.42 0.72** 0.49
Rheumatoid arthritis 0.54 0.52 0.63
Fluid and electrolyte disorders 3.45** 1.63** 2.27**
Obesity 0.25 0.40 0.75
Comorbidity counts
Without any comorbidity -- -- --
1 comorbid disease 1.06 1.70* 1.23
2 comorbid diseases 1.81** 2.43** 1.46
3 or more comorbid diseases 3.53** 3.04** 3.03*
Admission type
Emergency -- -- --
Planned (elective) 0.34** 0.80 0.27**
Primary payer
Other -- -- --
Private insurance 0.51 0.77 0.38
Hospital location and teaching status
Urban non-teaching -- -- --
Urban teaching 1.05 1.08 0.60
Rural 0.72 0.94 1.54
Hospital ownership
Nonprofit -- -- --
Public 1.30 1.13 0.85
For profit 0.99 1.11 0.86
Total hip replacement volume per year
11-99 (N=305) -- -- --
<10 (N=315) 0.75 0.89 0.73
100 or more (N=104) 0.71 0.85 1.15
THR = total hip replacement, PHR = partial hip replacement, and RHR = revision hip replacement.
* p<0.05, ** p<0.01; -- reference group; †Odds ratios were obtained by multiple logistic regression with the comorbidities included in the model. The odds ratios for the comorbidity counts were obtained without individual comorbidities in the model. Hospital size was not included because it is correlated with location, teaching status, and volume variables.
Table E-2: Significant predictors
*of postoperative complications and readmissions after hip replacement, summary from logistic regressions
Type of hip procedure Predictors
THR PHR RHR Postoperative decubitus ulcer
Increasing odds Age, for-profit hospital
Urban teaching hospital
Age Decreasing odds Female, planned
admission, private insurance
Female, private insurance, high volume
Female, planned admission, low volume Postoperative hemorrhage or
hematoma
Increasing odds Comorbidities Comorbidities Comorbidities Decreasing odds Planned
admission Postoperative PE or DVT
Increasing odds Comorbidities, urban teaching hospital
Comorbidities Comorbidities
Decreasing odds Rural hospital Female, private insurance, rural hospital, low volume Postoperative sepsis
Increasing odds Comorbidities Comorbidities Comorbidities Decreasing odds Private insurance
30-day readmission with hip procedure
Increasing odds Comorbidities Comorbidities Comorbidities
Decreasing odds Age
90-day readmission with hip procedure
Increasing odds Comorbidities Comorbidities
Decreasing odds Age, urban teaching
Age Age All-cause 30-day readmission
Increasing odds Age,
comorbidities, low volume
Age, comorbidities Comorbidities
Decreasing odds Private insurance Private insurance Private insurance All-cause 90-day readmission
Increasing odds Age,
comorbidities, low volume
Age, comorbidities, for-profit hospital
Comorbidities, urban teaching hospital Decreasing odds Private insurance Private insurance,
female
Private insurance THR = total hip replacement, PHR = partial hip replacement, and RHR = revision hip replacement. *Odds ratios for individual outcome measures available from author upon request. State inpatient databases do not contain variables identifying planned admissions versus emergency admissions; therefore this variable was not included in the regressions on readmissions.
